![Pablo Neira Ayuso](/assets/img/avatar_default.png)
Instead of IS_ENABLED(CONFIG_IPV6), otherwise we hit: et/built-in.o: In function `tee_tg6': >> xt_TEE.c:(.text+0x6cd8c): undefined reference to `nf_dup_ipv6' when: CONFIG_IPV6=y CONFIG_NF_DUP_IPV4=y # CONFIG_NF_DUP_IPV6 is not set CONFIG_NETFILTER_XT_TARGET_TEE=y Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
164 lines
3.9 KiB
C
164 lines
3.9 KiB
C
/*
|
|
* "TEE" target extension for Xtables
|
|
* Copyright © Sebastian Claßen, 2007
|
|
* Jan Engelhardt, 2007-2010
|
|
*
|
|
* based on ipt_ROUTE.c from Cédric de Launois
|
|
* <delaunois@info.ucl.be>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 or later, as published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/route.h>
|
|
#include <linux/netfilter/x_tables.h>
|
|
#include <net/route.h>
|
|
#include <net/netfilter/ipv4/nf_dup_ipv4.h>
|
|
#include <net/netfilter/ipv6/nf_dup_ipv6.h>
|
|
#include <linux/netfilter/xt_TEE.h>
|
|
|
|
struct xt_tee_priv {
|
|
struct notifier_block notifier;
|
|
struct xt_tee_tginfo *tginfo;
|
|
int oif;
|
|
};
|
|
|
|
static const union nf_inet_addr tee_zero_address;
|
|
|
|
static unsigned int
|
|
tee_tg4(struct sk_buff *skb, const struct xt_action_param *par)
|
|
{
|
|
const struct xt_tee_tginfo *info = par->targinfo;
|
|
|
|
nf_dup_ipv4(skb, par->hooknum, &info->gw.in, info->priv->oif);
|
|
|
|
return XT_CONTINUE;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NF_DUP_IPV6)
|
|
static unsigned int
|
|
tee_tg6(struct sk_buff *skb, const struct xt_action_param *par)
|
|
{
|
|
const struct xt_tee_tginfo *info = par->targinfo;
|
|
|
|
nf_dup_ipv6(skb, par->hooknum, &info->gw.in6, info->priv->oif);
|
|
|
|
return XT_CONTINUE;
|
|
}
|
|
#endif
|
|
|
|
static int tee_netdev_event(struct notifier_block *this, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct xt_tee_priv *priv;
|
|
|
|
priv = container_of(this, struct xt_tee_priv, notifier);
|
|
switch (event) {
|
|
case NETDEV_REGISTER:
|
|
if (!strcmp(dev->name, priv->tginfo->oif))
|
|
priv->oif = dev->ifindex;
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
if (dev->ifindex == priv->oif)
|
|
priv->oif = -1;
|
|
break;
|
|
case NETDEV_CHANGENAME:
|
|
if (!strcmp(dev->name, priv->tginfo->oif))
|
|
priv->oif = dev->ifindex;
|
|
else if (dev->ifindex == priv->oif)
|
|
priv->oif = -1;
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int tee_tg_check(const struct xt_tgchk_param *par)
|
|
{
|
|
struct xt_tee_tginfo *info = par->targinfo;
|
|
struct xt_tee_priv *priv;
|
|
|
|
/* 0.0.0.0 and :: not allowed */
|
|
if (memcmp(&info->gw, &tee_zero_address,
|
|
sizeof(tee_zero_address)) == 0)
|
|
return -EINVAL;
|
|
|
|
if (info->oif[0]) {
|
|
if (info->oif[sizeof(info->oif)-1] != '\0')
|
|
return -EINVAL;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (priv == NULL)
|
|
return -ENOMEM;
|
|
|
|
priv->tginfo = info;
|
|
priv->oif = -1;
|
|
priv->notifier.notifier_call = tee_netdev_event;
|
|
info->priv = priv;
|
|
|
|
register_netdevice_notifier(&priv->notifier);
|
|
} else
|
|
info->priv = NULL;
|
|
|
|
static_key_slow_inc(&xt_tee_enabled);
|
|
return 0;
|
|
}
|
|
|
|
static void tee_tg_destroy(const struct xt_tgdtor_param *par)
|
|
{
|
|
struct xt_tee_tginfo *info = par->targinfo;
|
|
|
|
if (info->priv) {
|
|
unregister_netdevice_notifier(&info->priv->notifier);
|
|
kfree(info->priv);
|
|
}
|
|
static_key_slow_dec(&xt_tee_enabled);
|
|
}
|
|
|
|
static struct xt_target tee_tg_reg[] __read_mostly = {
|
|
{
|
|
.name = "TEE",
|
|
.revision = 1,
|
|
.family = NFPROTO_IPV4,
|
|
.target = tee_tg4,
|
|
.targetsize = sizeof(struct xt_tee_tginfo),
|
|
.checkentry = tee_tg_check,
|
|
.destroy = tee_tg_destroy,
|
|
.me = THIS_MODULE,
|
|
},
|
|
#if IS_ENABLED(CONFIG_NF_DUP_IPV6)
|
|
{
|
|
.name = "TEE",
|
|
.revision = 1,
|
|
.family = NFPROTO_IPV6,
|
|
.target = tee_tg6,
|
|
.targetsize = sizeof(struct xt_tee_tginfo),
|
|
.checkentry = tee_tg_check,
|
|
.destroy = tee_tg_destroy,
|
|
.me = THIS_MODULE,
|
|
},
|
|
#endif
|
|
};
|
|
|
|
static int __init tee_tg_init(void)
|
|
{
|
|
return xt_register_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg));
|
|
}
|
|
|
|
static void __exit tee_tg_exit(void)
|
|
{
|
|
xt_unregister_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg));
|
|
}
|
|
|
|
module_init(tee_tg_init);
|
|
module_exit(tee_tg_exit);
|
|
MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>");
|
|
MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
|
|
MODULE_DESCRIPTION("Xtables: Reroute packet copy");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("ipt_TEE");
|
|
MODULE_ALIAS("ip6t_TEE");
|